Portion of a headset



FIG. 1 is an outer view of a headset showing our new design;

FIG. 2 is an outer elevational view thereof;

FIG. 3 is an inner elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof.

The broken line showing of the remainder of the headset is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a headset, as shown and described. 